Schedule Of Unallocated Items and Eliminations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Share-based plans			$ (148)	$ (141)
Total	1,564	1,714	4,682	4,247
Unallocated Items And Eliminations [Member]
Segment Reporting Information [Line Items]
Share-based plans	(23)	(19)	(64)	(63)
Deferred compensation	(15)	64	(49)	4
Pension	(204)	(58)	(608)	(216)
Postretirement	(30)	(175)	(79)	(208)
Capitalized interest	(16)	(8)	(53)	(39)
Eliminations and other	(87)	(110)	(126)	(182)
Total	$ (375)	$ (306)	$ (979)	$ (704)

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance.

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- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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